Diameter Gauge

This Thing is a Diameter Gauge, inspired by SubSite's Radius Gauge. For my purpose it was more appropriate to measure diameters, so that's what I've got; no real difference (though it simplifies the equations a bit). Also, I needed to measure somewhat larger diameters, up to 36" or so, so my gauge needed a larger span, to improve accuracy on diameters that size. This has a 200 mm span, which is the largest my printer could handle, with the part placed diagonally.

Then I noticed that with a larger span, you couldn't really do smaller diameters. I could have made a bunch of differently sized gauges, but instead I added a pair of removable probes that can be removed and replaced at span distances of 150, 100, and 60 mm. If you're using the 200 mm span, the probes can be removed and stored out of the way.

The caliper is clamped into the gauge very securely, and the slot for it accommodates the hardware found at the end of the caliper. My caliper is an older one from Harbor Frei